Annealing furnace



July 7, 1925. 1,544,792

- F. L. ANTISELL ANNEALING FURNAGE Filed Feb. 1'7, 1925 2 Sheets-Sheet l QN. .NMN 1w Patented July 7, 1925. y

.UNITED STATES FRANK L. AllrIsELL, or PERTH aiirizoY` New massa,

ANNEALING FURNACE.

Application led February 17, 1923. Serial No. 619,619.

To all whom t may concern.'

Be it known that I, F RANK L. ANTISELL, a citizen ol' the United States, and a resident ol lerth Amboy, county of Middlesex, State of New Jersey, have invented certain new and useful Improvements in Annealinpr Furnaces, ot' which the following is a specification.

The i'ivention relates particularly to a continuous non-o.\ridizin r, f,t annealing furnace, and one ol the objects'thereof is to ellect continuous anneal of a sheet or strip of metal, particularly copper, and which will, during the annealing operation prevent oxidation of the metal being,r treated.

Another object ofthe invention is to provide an annealing furnace in which the annealing heat is transmitted to the strip oi metal being operated upon by means ot' radiation from a previously heated metal strip forming a condutwall.

Another object is to provide `an annealing furnace so constructed that the heat is applied to the metal to be operated upon at a uniform temperature.4

Other ol "ects will appear from the subjoined ,specification and claims.

In the drawings forming a party of this specification Fig. 1 is alongitudinal section of an annealingr furnace embodyingr my invention.

Fig` 2 is a horizontal section of the saine on line 2-2 of Fig. 1.

Fig. 3 is a horizontal section on line 3`-,-3 of Fig. 1 showing in elevation a tragmen tary view of a coal chute.

Fig. 41 is a section on line 1-4 of Fig. 1.

Fig. 5 is a fragmentary sectional view of the mouth of the conduit. through which the strip of metal passes. In the figures the illustration is conven tional but` it is to be understood that the Walls of the furnace l0 may be made in any suitable way as by means of fireproot brick and concrete.

YAt, each end of the furnace are chambers 11 and 12, the chamber 11 being connected with the grate portion 13 which is provided with suitable grate bars 14 'and ash remover 15 upon which .the coal C is placed and ash pit 16, the coal beingr fed into the furnace from the 'hopper H.

The arrows 20 indicate the direction of the passage of the products of combustion and the heat units from the fire pit 11 to the chimney l2". The passagi'iways and 2G and 27 are formed within -the fui-iliace, the heat. units passingr i'roni the passagewa-ys 25 and 26 to the passageway 2T throufh openings 2S in the partition walls. 30 and 31..

:l The conduit 4() through which the strip 'ofinetal M to be annealed is to pass is constructed upon. a copper plate fil Whicl'i cx tends across the furnace and which 'forms notonly the heating element vfor 'the annealing operation. but also the door of the conduit. lhe copper plate 41 rests et each edge upon shoulders 42 and 13 formed on the inside of the brick walls of the furnace and is further supported by a body of sand S which fills the lower portion of the fur nace structure. annealingr conduit are formed by means of a series of sections of cast iron plates L14 provided with downwardly projecting flanges 45 and 46 on each side at the edge thereof. which flanges form supports and rest upon the copper floor and heatin plate 41. The conduit is therefore formed y laying' sections 44 of these cast iron lates end to end throughout the length o the furnace, one end section projecting outwardly and downwardly intol a tank T thus form- The top and sides of the ing a water seal 1V, in which tank is mounted a guide roller G under which the. strip of inetalulVl` which has been annealed, passes to the winding' roll R which receives the i annealed metal after it is passed through the furnace from the initial roll R suitably mountedand furnace.

v.'Io preclude the products of combustion from entering the annealing` conduit the cast iron sections 44 are covered with fire brick at their sides. as clearly shown in the drawing, and with sand and clay on top. This construction permits the expansion and contraction of the metal without causing a destruction ofthe furnace construction.

Tn order to preclude the entrance of air into the annealing` conduit the water seal W of the usual type. is formed at one' end and a pivoted flapper door D of cast iron seals the entrance to the conduit. thus tending to exclude air therefrom and to permit the building up in the conduit of an atmosphere of hot nitrogen gas because of the extracpositioned at the mouth of the tionof the oxygenby the heat 'of the first duit.

By means of this construction the heat transfer from and through the heating chamber, which is filled with the products of combustion of any suitable sort of fuel, heats the copper plate el which functions as a conduit. ing member 'upon which plate is built ,the

' conduit from the cast iron sections all, said conduit of course being made of suitable dimensions to', permit a continuous iiow of metal to be annealed.

ly means of the furnace hereinabove described, l am enabled to continuously anneal strips of metal, preferably copper, Without oxidation, the annealing being effected by radiation from the metal Wall or Walls of the annealing chamber, and at the same time obtain a heat efficiency suiiiciently high to re sult in rapid annealing. I

Furthermore, the application of the annealing heat from a previously heated metal Wall of copper which has been first heated so that its temperature is uniform throughout, renders the annealing uniform and obviates the tendency to over anneal with a 'loss due to the elongation of the metal and its resistance to all annealing stress,

Copper annealed by means of the furnace embodying my invention doesl not scale due to its being exposed tothe flame of theJ firel and it' it not therefore necessary to pickle,- Wash and dry the metal in order to preclude stainingy which is the usual practice during the operation of annealing in the prior art. As changes of construction could be made Within the scope of my invention, it is intended that all matter contained in the above description or shown in the accompanying drawing be interpreted as illustrative and not in a limiting sense. i Having described the invention what I claim and desire to'secure by Letters Patent i.. Apparatus of the type described which comprises furnace having a combustion chamber, an annealing chamber, in said furnace surrounded by heat resisting walls and a metallic heat conducting member extending from said chamber into said combustion chamber.

2. Apparatus of the type described which comprises a furnace having a comblltin mames chamber, an annealing chamber extending through said combustion chamber and pro- 'tected from direct transfer of heat from said combustion chamber and a metallic floor for vsaid annealing camber extending into said combustion chamber.-

3. Apparatus of the comprises a furnace chamber, an annealing chamber extending'v through said combustion ch'amber and protected fromv direct transfer of ieat from type described Which having -a combustion gases in said combustion chamber, a metallic Y floor for said annealing chamber extending into Contact with gasesin said combustion chamber and means dfor sealing the interior of said combustion chamber from the atmosphere.

4. Apparatus of the type described which comprises a furnace having a combustion chamber, an annealing ,'chamber extending through said combustion chamber and pro-y tected from direct transfer of heat from gases in said combustion chamber,I a metallic floor for said annealing chamber'extending into .contact with gases in said combustionA chamber, a sealing door at the `entrance end of said annealing` chamber and a water seal at the exit end of the saidjannealing chamber'.

.5. comprises a furnace having a combustion chamber, an annealing chamber extending therethrough and protected from -direct transfer of heat from gases in saidcombustion chamber, and a copper oor for said annealing chamber extending into contact with the combustion gases of said combustion chamber.

6. Appanatus of the type described which comprises a furnace having ay combustion chamber, an' annealing chamber extending through said combustion chamber, said annealingI chamber having a metallic floor ex- I tending into said combustion chamber into' contact with the hot gases of said combustion chamber and upper Walls protected from 'direct transfer of heat therethrough to the interior. of said `chamber.

7. Apparatus of the type described which comprises a furnace having a combustion chamber, a flue in said combustion chamber, an annealing conduit extending through said flue and protected from direct transfer of heat from the gases in said furnace, and a metallic plate extending from said annealing conduit into contact with the combustion gasesof said furnace. A

8. Apparatus of the type described which comprises a furnace" having a combustion chamber, a Hue in said combustion chamber having inlet ports for the admission of prod ucts of combustion from said combustion chamber, an annealing conduit extending through said Hue and protected from direct transfer olf-heat. from the gases in said flue,

Apparatus of the type described which' loo lao

and a heat conducting plate extending from said annealing conduit. intoy Contact with the gases in said' combustion chamber.

9. Apparatus of the type described which comprises a furnace hai-'ing ,a combustion chamber. a Hue in said combustion chamberhaving inlet ports for the admission of procL ucts of combustion fronrsaid combustion chamber, an annealing conduit extending through said flue'and protected from direct transfer of heat from tlie gases in said flue. a heat conducting plate extending fronisa'id annealing conduit `into contact with the gases in said combustion clnxinbcr and means 'for sealing tlic annealing vendait from the entrance oi atmospheric air.

l0, A\pparatns of the type which comprises a furnace haring a combusdescribedv tion chamber. an annealing chamber extending through said combustion chamber. and protected from direct transfer of heat from `the gases in said combustion chamber, said annealing chamber being formed Cf metallic sections. means for protecting the annealing chamber from direct contact with the furnace 'gases and means for sealing the ends of said chamber from the entrance ofl air.

FRANK L. ANT'ISELL l1. Apparatus of the type described 

